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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3625e54ec266d76fbae9deaed7f9c370ade5a3a3d85817fcb8bf888d4359bf' 
  AND token = 'X/cPKNS1Ac+hWRCAIKGMfZQ/6g/7ZOy0CZYmohHdhCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}